// 游戏框的显示与隐藏
let topMenu=document.getElementById('topMenu')
let iconLiebiao =  document.getElementById('icon-liebiao')
let iconCuo=  document.getElementById('icon-cuo')
iconLiebiao.onclick=()=>{
    topMenu.style.display='block'
    iconCuo.style.display='inline-block'
    iconLiebiao.style.display='none'
}
iconCuo.onclick=()=>{
    topMenu.style.display='none'
    iconCuo.style.display='none'
    iconLiebiao.style.display='inline-block'
}
//验证码生成
let canvas=document.getElementById('canvas')//画布对象

let show_num=[]//装验证码的数组
//产生随机颜色
function randomColor(){
    var r=  Math.floor( Math.random()*256);
    var g=  Math.floor( Math.random()*256);
    var b=  Math.floor( Math.random()*256);
   return  "rgb("+r+","+g+","+b+") "
}
//画布
function draw(show_num){
    let canvas_clientWidth=document.getElementById('canvas').clientWidth//画布长度
    let canvas_clientHeight=document.getElementById('canvas').clientHeight//画布高度
    let context = canvas.getContext("2d")//画布环境 创建 context 对象：
    canvas.width=canvas_clientWidth
    canvas.height=canvas_clientHeight
    let str="A,B,C,E,F,G,H,J,K,L,M,N,P,Q,R,S,T,W,X,Y,Z,1,2,3,4,5,6,7,8,9,0,q,w,e,r,t,y,u,i,o,p,a,s,d,f,g,h,j,k,l,z,x,c,v,b,n,m";
   let  astr=str.split(',');//分割字符串形成数组
   let sLength=astr.length;//数组长度
   for (let i = 0; i <= 3; i++) {
       let j=Math.floor(Math.random()*sLength);//随机索引
       let deg=Math.random()*30*Math.PI/180;//0-30随机弧度
       let text=astr[j];//随机字符
       show_num[i]=text//验证码字符数组
       let x=10+i*20//x坐标
       let y=20+Math.random()*8//y坐标
       //位移 旋转角度 颜色 文字 样式开始位置
       context.font='bold 23px 微软雅黑'
       context.translate(x, y);
       context.rotate(deg);
       context.fillStyle = randomColor();
       context.fillText(text,0,0)
       context.rotate(-deg)
       context.translate(-x,-y)
   }
   //验证码显示小点
   for(let i=0;i<=30;i++){
     context.strokeStyle=randomColor()//设置随机色用小点的颜色
     context.beginPath();//开始一条路径
     let m=Math.random()*canvas_clientWidth;
     let n=Math.random()*canvas_clientHeight;
     context.moveTo(m,n)//移动
     context.lineTo(m + 1, n + 1);//添加一个新点，然后在画布中创建从该点到最后指定点的线条
     context.stroke();//画上面定义好的路径
   }
   //验证码显示线条
   for (let i = 0; i < 8; i++) {
       context.strokeStyle=randomColor()
       context.beginPath()
       context.moveTo(Math.random()*canvas_clientWidth,Math.random()*canvas_clientHeight);
       context.lineTo(Math.random()*canvas_clientWidth,Math.random()*canvas_clientHeight)
       context.stroke()
       
   }

}
draw(show_num)
console.log(show_num);

canvas.onclick=()=>{
draw(show_num)
// console.log(show_num);
}
//验证码校验  表单校验
let login_btn=document.getElementById('login_btn')

login_btn.onclick=()=>{
    let code=show_num.join('')
    // console.log(code);
    let login_code=document.getElementById('login_code').value
    let username=document.getElementById('username').value
    let password=document.getElementById('password').value
    let msg=document.getElementById('msg')
    if(login_code!=null&&login_code!=''){
        if(login_code.toLowerCase().trim()!=code.toLowerCase().trim()){
            msg.innerHTML='验证码输入错误'
        }
    }
    setTimeout(() => {
        msg.innerHTML=''
    }, 3000);
}

